WO2003017654A1 - Systeme d'affichage par projection et module d'eclairage - Google Patents

Systeme d'affichage par projection et module d'eclairage Download PDF

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Publication number
WO2003017654A1
WO2003017654A1 PCT/IB2002/003307 IB0203307W WO03017654A1 WO 2003017654 A1 WO2003017654 A1 WO 2003017654A1 IB 0203307 W IB0203307 W IB 0203307W WO 03017654 A1 WO03017654 A1 WO 03017654A1
Authority
WO
WIPO (PCT)
Prior art keywords
liquid crystal
state light
state
control signal
light
Prior art date
Application number
PCT/IB2002/003307
Other languages
English (en)
Inventor
Robert H. Kane
Steven J. Kane
Original Assignee
Koninklijke Philips Electronics N.V.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Koninklijke Philips Electronics N.V. filed Critical Koninklijke Philips Electronics N.V.
Priority to EP02755515A priority Critical patent/EP1421786A1/fr
Priority to JP2003521614A priority patent/JP2005500574A/ja
Priority to KR10-2004-7002189A priority patent/KR20040036706A/ko
Publication of WO2003017654A1 publication Critical patent/WO2003017654A1/fr

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
    • G02B27/283—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising used for beam splitting or combining
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/2053—Intensity control of illuminating light
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/74—Projection arrangements for image reproduction, e.g. using eidophor

Definitions

  • the present invention relates generally to an illumination control for a projection display system and, more particularly, to a projection system illumination module for controlling the intensity of light from a discharge lamp through controlling polarization of the light beam.
  • a discharge lamp is used as the preferable light source.
  • Narious attempts have been made to incorporate light intensity controls for discharge lamps by the use of devices inside the projector.
  • such "within the projector" systems have not yet been perfected to be satisfactory in the control of the intensity of lights from a discharge lamp, especially a high- pressure mercury discharge lamp which is a preferred light source for projection display systems.
  • the light intensity is controlled outside of the projection system optics by means of an electronically controlled illumination module that may be used with any projection system.
  • an electronically controlled illumination module that may be used with any projection system.
  • Such a system does not require motors or actuators to operate and, accordingly, is able to respond quickly to changes in the video signal if dynamic dimming is desired.
  • the illumination module of this invention will not absorb input radiation and, therefore, is not subjected to thermal changes which can effect reliable operation, especially for static dimming.
  • the illumination module of this invention By positioning the illumination module of this invention outside the projection system optics, the illumination module may be used to control the intensity of light with any projection system, and eliminates any potential thermal problems occasioned by overheating components. Because the illumination module control of the present invention is completely electronic, response time to video signal level changes is extremely short, so that the illumination control system can respond quickly if dynamic dimming is desired.
  • the illumination module of the present invention has no mechanical elements and no moving parts, but utilizes a polarizing beam splitter to split the light beam from the projection lamp into two polarization states, selectively altering the state of each polarized light beam to reject a controlled portion of the light before the selectively altered beams are recombined and passed to the display projection optics.
  • This system is especially effective for controlling dynamic dimming. Further advantageous embodiments are specified in the dependent claims.
  • Fig. 1 shows a diagrammatic drawing of a projection system with an illumination control module.
  • one embodiment of the invention is illustrated splitting the light beam from a discharge lamp source into “p” and “s” linear polarization states at the splitting element, with each beam fraction subsequently passing through a separate liquid crystal (LC) rotator actuator.
  • the polarization states are independently rotated by the LC devices and the separate beams are recombined at a second polarizing beamsplitter element.
  • the degree of polarization rotation by the LC cells determines the fraction of light allowed by that element to pass to the projector optics.
  • a discharge lamp 10 preferably a short-arc high pressure mercury discharge lamp
  • a parabolic reflector 11 to produce a nominally parallel beam of light.
  • the beam of light so produced passes through a first polarizing beam splitter(PBS) 20 which splits the light beam with approximately half the light (p-state) being transmitted through the polarizing beam splitter 20 and the remainder (approximately half, less minor optical losses), the orthogonal polarization state (s state), being reflected.
  • PBS first polarizing beam splitter
  • the direct beam (original p state) passes through an electronically controlled liquid crystal (LC) rotator 25, such as is available from Meadowlark Optics, P.O. Box 1000, 5964 Iris Parkway, Frederick, Colorado 80530 which in response to an applied voltage, rotates the plane of polarization to alter the ratio of s top light in the beam, referred to the axes of the PBS elements.
  • LC liquid crystal
  • This rotation can be in response to either an applied voltage from a dimming control circuit 26 or from some other input measurement of the video level.
  • the original p state light now rotated by LC rotator 20 is then reflected by a first turning mirror 28 to a second PBS 30 which reflects orthogonally the fraction of local s light to the projector optics 40 and transmits the fraction of local p light to a beam dump and is lost to the system.
  • a second PBS 30 which reflects orthogonally the fraction of local s light to the projector optics 40 and transmits the fraction of local p light to a beam dump and is lost to the system.
  • the polarization state is rotated 90 degrees by LC rotator 20 then all the light incident on PBS 30 is estate light and will be reflected to the projector optics 40 (less minor optical losses inherent in practical PBS elements).
  • the 5-state light orthogonally reflected by the first PBS 20 is reflected by a second turning mirror 38 through a second similar electronically controlled liquid crystal (LC) rotator 35 which in response to an applied voltage rotates the plane of polarization in response to either an applied voltage from a dimming control 26 or some other input which is a measurement of some aspect(s)of the video signal to rotate the plane of polarization by a desired amount.
  • the fraction of light which is now of s polarization state at the active surface of PBS 30 is reflected orthogonally to the beam dump while the fraction ofp polarization state at the active surface of PBS 30 is transmitted to projector optics 40.
  • each light path undergoes the same losses on reflection at the turning mirrors 28 and 38.
  • each LC rotator 25,35 must rotate the polarization state by 90 degrees since the other PBS is best designed to reflect the local s component and transmits the local p component of the polarization state. Dimming is effected when pre-described voltages are applied to the LC rotators 25,35, either manually for static dimming or overall level of control, or dynamically in response to variations in the video signal level applied to each of the rotators by their associated control circuits 26 and 36, respectively.
  • the characteristics of the LC rotators 25, 35 may be different in each light path.
  • Such a difference in characteristics may be desirable because the degree of polarization rotation is wave-length dependent. For example, it may be preferable to optimize one of the LC rotators for a wave length slightly shorter than optimum green, while the other LC rotator is optimized for a wave-length slightly longer.
  • the illumination control system may also be constructed as a monolith of cemented prisms. With the liquid crystal rotators 25, 35 being sandwiched between the separation and re-combination PBS modules 20, 30.
  • the illumination control system may also be constructed as a fluid-filled tank to increase the overall dimming ratio by improving the performance of the PBS coatings. In this manner it is possible to reduce the infrared transmission to the projection optics by absorption, an important consideration when using very high power sources.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Optics & Photonics (AREA)
  • Liquid Crystal (AREA)
  • Projection Apparatus (AREA)

Abstract

L'invention concerne un module d'éclairage externe commandé électroniquement dans lequel sont utilisés des diviseurs (20, 30) de faisceau de polarisation pour diviser le faisceau lumineux d'une lampe (10) de projection en deux états de polarisation, modifiant de manière sélective l'état de chaque faisceau lumineux polarisé pour rejeter une partie contrôlée de la lumière (25, 35), les faisceaux sélectivement modifiés étant recombinés et transférés au dispositif optique (40) du système de projection.
PCT/IB2002/003307 2001-08-15 2002-08-14 Systeme d'affichage par projection et module d'eclairage WO2003017654A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP02755515A EP1421786A1 (fr) 2001-08-15 2002-08-14 Systeme d'affichage par projection et module d'eclairage
JP2003521614A JP2005500574A (ja) 2001-08-15 2002-08-14 投射型表示システム及び照明モジュール
KR10-2004-7002189A KR20040036706A (ko) 2001-08-15 2002-08-14 프로젝션 디스플레이 시스템 및 조명 모듈

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/930,347 US6509694B1 (en) 2001-08-15 2001-08-15 Dimmable illumination module for projection systems using a high-intensity discharge lamp via polarization manipulation
US09/930,347 2001-08-15

Publications (1)

Publication Number Publication Date
WO2003017654A1 true WO2003017654A1 (fr) 2003-02-27

Family

ID=25459236

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2002/003307 WO2003017654A1 (fr) 2001-08-15 2002-08-14 Systeme d'affichage par projection et module d'eclairage

Country Status (7)

Country Link
US (1) US6509694B1 (fr)
EP (1) EP1421786A1 (fr)
JP (1) JP2005500574A (fr)
KR (1) KR20040036706A (fr)
CN (1) CN1541477A (fr)
TW (1) TW557401B (fr)
WO (1) WO2003017654A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004052025A1 (fr) * 2002-12-04 2004-06-17 Thomson Licensing S. A. Amelioration de la gamme dynamique et du contraste pour microaffichages

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030128427A1 (en) * 2002-01-10 2003-07-10 Kalmanash Michael H. Dual projector lamps
CN108919494B (zh) * 2018-08-01 2021-02-02 张家港康得新光电材料有限公司 一种抬头显示装置及汽车

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59124044A (ja) * 1982-12-28 1984-07-18 Toshiba Corp 光学装置
FR2658925A1 (fr) * 1990-02-23 1991-08-30 Sextant Avionique Dispositif d'eclairage en lumiere polarisee et materiel de visualisation comportant au moins un tel dispositif.

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6309071B1 (en) * 1999-08-04 2001-10-30 Sharp Laboratories Of America, Inc. Liquid crystal projection display system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59124044A (ja) * 1982-12-28 1984-07-18 Toshiba Corp 光学装置
FR2658925A1 (fr) * 1990-02-23 1991-08-30 Sextant Avionique Dispositif d'eclairage en lumiere polarisee et materiel de visualisation comportant au moins un tel dispositif.

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 008, no. 254 (P - 315) 21 November 1984 (1984-11-21) *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004052025A1 (fr) * 2002-12-04 2004-06-17 Thomson Licensing S. A. Amelioration de la gamme dynamique et du contraste pour microaffichages
US7359008B2 (en) 2002-12-04 2008-04-15 Thomson Licensing Dynamic range and contrast enhancement for microdisplay

Also Published As

Publication number Publication date
CN1541477A (zh) 2004-10-27
KR20040036706A (ko) 2004-04-30
EP1421786A1 (fr) 2004-05-26
US6509694B1 (en) 2003-01-21
JP2005500574A (ja) 2005-01-06
TW557401B (en) 2003-10-11

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